shields: seeed_w5500: new shield

Support "W5500 Ethernet Shield" manufactured by Seeed Studio.

[1] https://www.seeedstudio.com/W5500-Ethernet-Shield.html

Signed-off-by: Marcin Niestroj <m.niestroj@emb.dev>

boards/shields/seeed_w5500/Kconfig.defconfig

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+# Copyright (c) 2024 Marcin Niestroj
+# SPDX-License-Identifier: Apache-2.0
+
+if SHIELD_SEEED_W5500
+
+if NETWORKING
+
+config NET_L2_ETHERNET
+	default y
+
+endif # NETWORKING
+
+endif # SHIELD_SEEED_W5500

boards/shields/seeed_w5500/Kconfig.shield

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+# Copyright (c) 2024 Marcin Niestroj
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_SEEED_W5500
+	def_bool $(shields_list_contains,seeed_w5500)

boards/shields/seeed_w5500/doc/index.rst

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+.. _seeed_w5500:
+
+Seeed W5500 Ethernet Shield
+###########################
+
+Overview
+********
+
+Seeed `W5500 Ethernet Shield`_ is an Arduino connector shield with:
+
+- `W5500`_ 10/100 MBPS stand alone Ethernet controller with on-board MAC & PHY
+  and 16 KiloBytes for FIFO buffer,
+- SPI serial interface,
+- Grove UART connector,
+- Grove I2C connector,
+- SD card slot.
+
+.. figure:: seeed_w5500.webp
+   :align: center
+   :alt: Seeed W5500 Ethernet Shield
+
+   Seeed W5500 Ethernet Shield
+
+Pins Assignment of the W5500 Shield
+===================================
+
++-----------------------+---------------------------------------------+
+| Shield Connector Pin  | Function                                    |
++=======================+=============================================+
+| RST                   | Ethernet Controller's Reset                 |
++-----------------------+---------------------------------------------+
+| D2                    | Ethernet Controller's Interrupt Output      |
++-----------------------+---------------------------------------------+
+| D10                   | SPI's Chip Select                           |
++-----------------------+---------------------------------------------+
+| D11                   | SPI's Master Output Slave Input (MOSI)      |
++-----------------------+---------------------------------------------+
+| D12                   | SPI's Master Input Slave Output (MISO)      |
++-----------------------+---------------------------------------------+
+| D13                   | SPI's Clock                                 |
++-----------------------+---------------------------------------------+
+
+Requirements
+************
+
+This shield can only be used with a board that provides a configuration
+for Arduino connectors and defines node aliases for SPI and GPIO interfaces
+(see :ref:`shields` for more details).
+
+Programming
+***********
+
+Set ``--shield seeed_w5500`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/net/dhcpv4_client
+   :board: nrf52840dk/nrf52840
+   :shield: seeed_w5500
+   :goals: build
+
+References
+**********
+
+.. target-notes::
+
+.. _W5500:
+   https://wiznet.io/products/iethernet-chips/w5500
+
+.. _W5500 Ethernet Shield:
+   https://wiki.seeedstudio.com/W5500_Ethernet_Shield_v1.0

boards/shields/seeed_w5500/seeed_w5500.overlay

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+/*
+ * Copyright (c) 2024 Marcin Niestroj
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&arduino_spi {
+	status = "okay";
+
+	eth_w5500: eth-w5500@0 {
+		compatible = "wiznet,w5500";
+		reg = <0x0>;
+		spi-max-frequency = <DT_FREQ_M(20)>;
+		int-gpios = <&arduino_header 8 GPIO_ACTIVE_LOW>;	/* D2 */
+	};
+};